Вопрос школьника по предмету Математика
Срочно !!!
Раскройте скобки и найдите значение выражения
1. 6,8 + (- 2,8 — 6,8)
2. — ( 0,39 + 2,1)+(0,13 * 3 — 2,1)- 0,8
3. ( 4,3918-16,4)- ( 4,3917 — 4,1 * 4 )
4. ( 3,29 + 1 ) — ( 1,2 +1 ) — ( 1 — 0,91)
Ответ учителя по предмету Математика
1. 6,8 + (- 2,8 — 6,8)=6,8+(-2,8)-6,8= -2,8
2. — ( 0,39 + 2,1)+(0,13 * 3 — 2,1)- 0,8=0,39-2,1+0,13*3-2,1= -3,42
3. ( 4,3918-16,4)- ( 4,3917 — 4,1 * 4 )=4,3918-16,4-4,3917+4,1*4=0,0001
4. ( 3,29 + 1 ) — ( 1,2 +1 ) — ( 1 — 0,91) =3.29+1-1,2-1-1+0,91=2
По моему так.
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